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TypeScript in Depth · Generics · Lesson 9 of 16

Generic Interfaces

Concept

Generic Interfaces

Interfaces can also take type parameters, useful for reusable shapes like API responses.

By the end of this lesson
  • Explain the core idea behind Generic Interfaces.
  • Predict output before running a change.
  • Test one realistic and one unusual input.
  • Use the result to make the next decision.
How to study this page
  1. 1. Read one concept.
  2. 2. Change the example.
  3. 3. Run, compare, and explain.
  4. 4. Complete the challenge below.
ExampleRunnable
interface ApiResponse<T> {
  data: T;
  success: boolean;
}
Try it Yourself »
Self-check before continuing

Without looking at the example, describe what changes when you modify one input in Generic Interfaces. Then reopen the editor and prove your explanation with a small test.

You are ready to continue when you can predict, test, and explain the result.

Your turn

Define a generic Box<T> interface with a single value: T property.

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Console

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